LEGISLATION – VISUAL INSPECTION FOR DEFECTS OF GLASS
The quality control of low-e glass in accordance with the specifications EN 1096–1
1. Lighting conditions to identify defects
The defects are seen inspecting the glass in transmission and/or reflection. Can be used as light sources, both artificial light that natural light.
– Artificial light: see definition in EN 1096–1
– Natural light: dark sky without direct sunlight.
2. conditions of inspection:
The glass can be inspected in standard-sized panels or final measures ready to be installed.
The glass of the glazing that vienne checked you look from a distance of minimum3 meters.
Reflective glass inspection must be carried out by the observer, looking out towardsthe outside of the plates.
Control of low-e glass must be done by the observer who looks at the part that is located inside the double glazing. (the inner face of the slab)
While checking (in reflection or transmission) the angle between the surface of theglass and the beam, to the eyes of the observer, after reflection or transmission, low-e glass should not exceed 30 degrees.
Each control should not last more than 20 seconds.
3. The definition of the surface that you have to control, to the final measurements:
Low-e glass panels with final measurements ready to be mounted, will be examinedboth the surface main (Central), the edge of the glass surface.
Surface to be check, final measurements
4. Definition of apparent defects
4.1. The lack of uniformity
The change color slightly visible, in the process of reflection or transmission, low emissive glass, or from glass to glass.
4.2. The stain
Defect in a part covered with metallic oxides above point defect, appearing often inirregular shapes, partly in the form – spotted stained.
4.3. The defect on time
Disorder of the Visual transparency between the glass and Visual reflection looking ahead looking glass. The stain, the bubbles and the graffiti are types of defects on time.
–stain: defect that usually appears black to the surface near, when you look at the transmission.
– bubbles: part bollicinea fit on time on the surface covered with partial or total absence of the coating and that normally thwarts clearly with the coated side, when you look at the transmission
– scratches: variety of trace increased linearly, whose visibility depends on the length, thickness, positioning and their arrangement.
4.4. the Group of defects
Accumulation of small flaws that give the appearance of stains
5. Acceptance criteria for low-e glass defects
5.1. defects regarding the uniformity and stains
Inspection of conditions mentioned in paragraph 2, observe any change in coverage is to the inside of the glass, both between neighbouring plates that are disturbed at the Visual Layer.
5.2. point Defects
Inspection of conditions mentioned in paragraph 2, observed any blemish, blister and/or scratches that are disturbed at the Visual Layer.
For stains/bubbles, measure the size and certain number relative to the size of the glass.
If you find any type of group, will be given their relative position on the surface.
For certain if they are located in the central surface scratches or in from the edge. Measure the length of any graffiti noted. To scratches than 75 mm, determine the distance between adjacent scratches. For those under 75 mm long observed the surfacewhere their density is disrupting view.
5.3. Acceptance criteria for low-e glass defects
The acceptance criteria of low-e glass defects, inspected in accordance with paragraph 2, are mentioned in the table: